<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			
			p{
				width: 100px;
				height: 100px;
				background: #F00;
			}
			h3{
				width: 100px;
				height: 100px;
				background: #FF0;
			}
		</style>
	</head>
	<body>
		<p>这是段落</p>
		<h3>这是标题</h3>
	</body>
</html>
